package com.ruoyi.common.utils;

import java.util.Random;

/**
 * @ClassName RandomUtils
 * @Description
 * @Author wed
 * @Date 2022/3/25
 * @Version 1.0
 **/
public class RandomUtils {
    /**
     * 生成随机用户名，数字和字母组成,
     * @param length 长度
     * @return
     */
    public static String getStringRandom(int length) {
        String val = "";
        Random random = new Random();
        //参数length，表示生成几位随机数
        for (int i = 0; i < length; i++) {
            String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
            //输出字母还是数字
            if ("char".equalsIgnoreCase(charOrNum)) {
                //输出是大写字母还是小写字母
                int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;
                val += (char) (random.nextInt(26) + temp);
            } else if ("num".equalsIgnoreCase(charOrNum)) {
                val += String.valueOf(random.nextInt(10));
            }
        }
        return val;
    }

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            System.out.println(getStringRandom(6));
        }
    }
}
